package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

        String requestURL=request.getRequestURI();
        log.info("拦截到请求:{}",requestURL);
        String[] urls=new String[]{

                "/user/sendMsg",
                "/user/login",
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**"
        };

        boolean check = check(urls, requestURL);

        if(check){
            log.info("请求:{}不需要处理",requestURL);
            filterChain.doFilter(request,response);
            return;
        }
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));

            Long empId=(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request,response);
            return;
        }

        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));

            Long empId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }


    public boolean check(String[] urls,String requestURI){
        for (String url:urls){
            boolean match=PATH_MATCHER.match(url,requestURI);
            if(match){
                return  true;
            }
        }
        return  false;
    }
}
